1 files changed, 214 insertions, 0 deletions

diff --git a/contrib/SDL-3.2.8/src/video/x11/SDL_x11xfixes.c b/contrib/SDL-3.2.8/src/video/x11/SDL_x11xfixes.c
new file mode 100644
index 0000000..517ebc8
--- /dev/null
+++ b/contrib/SDL-3.2.8/src/video/x11/SDL_x11xfixes.c
@@ -0,0 +1,214 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include "SDL_internal.h"
+
+#if defined(SDL_VIDEO_DRIVER_X11) && defined(SDL_VIDEO_DRIVER_X11_XFIXES)
+
+#include "SDL_x11video.h"
+#include "SDL_x11xfixes.h"
+#include "../../events/SDL_mouse_c.h"
+#include "../../events/SDL_touch_c.h"
+
+static bool xfixes_initialized = true;
+static int xfixes_selection_notify_event = 0;
+
+static int query_xfixes_version(Display *display, int major, int minor)
+{
+    // We don't care if this fails, so long as it sets major/minor on it's way out the door.
+    X11_XFixesQueryVersion(display, &major, &minor);
+    return (major * 1000) + minor;
+}
+
+static bool xfixes_version_atleast(const int version, const int wantmajor, const int wantminor)
+{
+    return version >= ((wantmajor * 1000) + wantminor);
+}
+
+void X11_InitXfixes(SDL_VideoDevice *_this)
+{
+    SDL_VideoData *data = _this->internal;
+
+    int version = 0;
+    int event, error;
+    int fixes_opcode;
+
+    Atom XA_CLIPBOARD = data->atoms.CLIPBOARD;
+
+    if (!SDL_X11_HAVE_XFIXES ||
+        !X11_XQueryExtension(data->display, "XFIXES", &fixes_opcode, &event, &error)) {
+        return;
+    }
+
+    // Selection tracking is available in all versions of XFixes
+    xfixes_selection_notify_event = event + XFixesSelectionNotify;
+    X11_XFixesSelectSelectionInput(data->display, DefaultRootWindow(data->display),
+            XA_CLIPBOARD, XFixesSetSelectionOwnerNotifyMask);
+    X11_XFixesSelectSelectionInput(data->display, DefaultRootWindow(data->display),
+            XA_PRIMARY, XFixesSetSelectionOwnerNotifyMask);
+
+    // We need at least 5.0 for barriers.
+    version = query_xfixes_version(data->display, 5, 0);
+    if (!xfixes_version_atleast(version, 5, 0)) {
+        return; // X server does not support the version we want at all.
+    }
+
+    xfixes_initialized = 1;
+}
+
+bool X11_XfixesIsInitialized(void)
+{
+    return xfixes_initialized;
+}
+
+int X11_GetXFixesSelectionNotifyEvent(void)
+{
+    return xfixes_selection_notify_event;
+}
+
+bool X11_SetWindowMouseRect(SDL_VideoDevice *_this, SDL_Window *window)
+{
+    if (SDL_RectEmpty(&window->mouse_rect)) {
+        X11_ConfineCursorWithFlags(_this, window, NULL, 0);
+    } else {
+        if (window->flags & SDL_WINDOW_INPUT_FOCUS) {
+            X11_ConfineCursorWithFlags(_this, window, &window->mouse_rect, 0);
+        } else {
+            // Save the state for when we get focus again
+            SDL_WindowData *wdata = window->internal;
+
+            SDL_memcpy(&wdata->barrier_rect, &window->mouse_rect, sizeof(wdata->barrier_rect));
+
+            wdata->pointer_barrier_active = true;
+        }
+    }
+
+    return true;
+}
+
+bool X11_ConfineCursorWithFlags(SDL_VideoDevice *_this, SDL_Window *window, const SDL_Rect *rect, int flags)
+{
+    /* Yaakuro: For some reason Xfixes when confining inside a rect where the
+     * edges exactly match, a rectangle the cursor 'slips' out of the barrier.
+     * To prevent that the lines for the barriers will span the whole screen.
+     */
+    SDL_VideoData *data = _this->internal;
+    SDL_WindowData *wdata;
+
+    if (!X11_XfixesIsInitialized()) {
+        return SDL_Unsupported();
+    }
+
+    // If there is already a set of barriers active, disable them.
+    if (data->active_cursor_confined_window) {
+        X11_DestroyPointerBarrier(_this, data->active_cursor_confined_window);
+    }
+
+    SDL_assert(window != NULL);
+    wdata = window->internal;
+
+    /* If user did not specify an area to confine, destroy the barrier that was/is assigned to
+     * this window it was assigned */
+    if (rect) {
+        int x1, y1, x2, y2;
+        SDL_Rect bounds;
+        SDL_GetWindowPosition(window, &bounds.x, &bounds.y);
+        SDL_GetWindowSize(window, &bounds.w, &bounds.h);
+
+        /** Negative values are not allowed. Clip values relative to the specified window. */
+        x1 = bounds.x + SDL_max(rect->x, 0);
+        y1 = bounds.y + SDL_max(rect->y, 0);
+        x2 = SDL_min(bounds.x + rect->x + rect->w, bounds.x + bounds.w);
+        y2 = SDL_min(bounds.y + rect->y + rect->h, bounds.y + bounds.h);
+
+        if ((wdata->barrier_rect.x != rect->x) ||
+            (wdata->barrier_rect.y != rect->y) ||
+            (wdata->barrier_rect.w != rect->w) ||
+            (wdata->barrier_rect.h != rect->h)) {
+            wdata->barrier_rect = *rect;
+        }
+
+        // Use the display bounds to ensure the barriers don't have corner gaps
+        SDL_GetDisplayBounds(SDL_GetDisplayForWindow(window), &bounds);
+
+        /** Create the left barrier */
+        wdata->barrier[0] = X11_XFixesCreatePointerBarrier(data->display, wdata->xwindow,
+                                                           x1, bounds.y,
+                                                           x1, bounds.y + bounds.h,
+                                                           BarrierPositiveX,
+                                                           0, NULL);
+        /** Create the right barrier */
+        wdata->barrier[1] = X11_XFixesCreatePointerBarrier(data->display, wdata->xwindow,
+                                                           x2, bounds.y,
+                                                           x2, bounds.y + bounds.h,
+                                                           BarrierNegativeX,
+                                                           0, NULL);
+        /** Create the top barrier */
+        wdata->barrier[2] = X11_XFixesCreatePointerBarrier(data->display, wdata->xwindow,
+                                                           bounds.x, y1,
+                                                           bounds.x + bounds.w, y1,
+                                                           BarrierPositiveY,
+                                                           0, NULL);
+        /** Create the bottom barrier */
+        wdata->barrier[3] = X11_XFixesCreatePointerBarrier(data->display, wdata->xwindow,
+                                                           bounds.x, y2,
+                                                           bounds.x + bounds.w, y2,
+                                                           BarrierNegativeY,
+                                                           0, NULL);
+
+        X11_XFlush(data->display);
+
+        // Lets remember current active confined window.
+        data->active_cursor_confined_window = window;
+
+        /* User activated the confinement for this window. We use this later to reactivate
+         * the confinement if it got deactivated by FocusOut or UnmapNotify */
+        wdata->pointer_barrier_active = true;
+    } else {
+        X11_DestroyPointerBarrier(_this, window);
+
+        // Only set barrier inactive when user specified NULL and not handled by focus out.
+        if (flags != X11_BARRIER_HANDLED_BY_EVENT) {
+            wdata->pointer_barrier_active = false;
+        }
+    }
+    return true;
+}
+
+void X11_DestroyPointerBarrier(SDL_VideoDevice *_this, SDL_Window *window)
+{
+    int i;
+    SDL_VideoData *data = _this->internal;
+    if (window) {
+        SDL_WindowData *wdata = window->internal;
+
+        for (i = 0; i < 4; i++) {
+            if (wdata->barrier[i] > 0) {
+                X11_XFixesDestroyPointerBarrier(data->display, wdata->barrier[i]);
+                wdata->barrier[i] = 0;
+            }
+        }
+        X11_XFlush(data->display);
+    }
+    data->active_cursor_confined_window = NULL;
+}
+
+#endif // SDL_VIDEO_DRIVER_X11 && SDL_VIDEO_DRIVER_X11_XFIXES